根中的导管,开始分化形成的部位是( ) A.分生区 B.伸长区 C.成熟区

题型:选择题

问题:

根中的导管,开始分化形成的部位是(  )

A.分生区

B.伸长区

C.成熟区

D.成熟区的上部

考点:根适于吸水的特点
题型:选择题

按照C组术语成交,货物启运后的风险由( )负担。

A.卖方

B.买方

C.承运方

D.保险公司

题型:选择题

下列关于卤素的叙述,正确的是(  )

A.单质的颜色随核电荷数的增加逐渐加深

B.卤化银的溶解度随核电荷数的增加逐渐增大

C.单质与水反应均可表示为X2+H2OHX+HXO

D.随核电荷数的增加,X-的半径递增,还原性递减

题型:选择题

骨骺损伤机制包括()

A.持续劳损力

B.肌肉、肌腱的牵拉力

C.纵向挤压力

D.成角作用力

E.传达外力

题型:选择题

长期边际成本同短期边际成本的关系可描述为()

A.长期边际成本曲线是短期边际成本曲线最低点的连线

B.长期边际成本曲线是短期边际成本曲线的包络线

C.两线之间没有直接联系

D.以上全不对

题型:选择题

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United Nations officials say (5) ________of that is needed during the next six months.The concern about offers of international aid is (6)________. For example, the earthquake in Bam, Iran, in (7)________of 2003 killed more than (8) ________people. Countries and groups offered hundreds of millions of dollars (9) ________. The United Nations says it has (10)________only about (11)________dollars in aid received so far. Governments and organizations that offered help (12) ________that, however.On (13)________Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14)________. The leaders discussed and (15)________the idea of (16)________owed by affected nations. But the leaders did not say they would do so. Some said that (17)________to survivors would be more helpful.Representatives of (18)________countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19)________ for the Indian Ocean and the (20)________.

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